LISA telescope assembly optical stability characterization for ESA

Abstract

Abstract-The LISA Optical Stability Characterization project is part of the LISA CTP activities to achieve the required Technology Readiness Level (TRL) for all of the LISA technologies used. This activity aims demonstration of the Telescope Assembly (TA), with a structure based on CFRP technology, that a CTE of 10 -7 1/K can be achieved with measures to tune the CTE to this level. In addition the demonstration is required to prove that the structure exhibits highly predictable mechanical distortion characteristics when cooling down to -90°C, during outgassing in space and when going from 1g environment to 0g. This paper describes the test facilities as well as the first test results.A dedicated test setup is designed and realized to allow monitoring dimensional variations of the TA using three interferometers, while varying the temperature in a thermal vacuum chamber. Critical parameters of the verification setup are the length metrology accuracy in thermal vacuum and the thermal vacuum flexibility and stability. The test programme includes Telescope Assembly CTE measurements and thermal gradient characterization.

Radiation and electrostatic resistance for ultra-stable polymer composites reinforced with carbon fibers

“…For many space missions, highly stable, lightweight, and functional structures are essential to support precision apertures and finely calibrated instruments on satellites (1)(2)(3)(4). Stable structures, such as optical benches, telescope tubes, parabolic reflectors, rovers, and lander structures, are required for precision optics, radar, and scientific instruments for various deep-space, Earth, Observation, Navigation and Science (ENS), and exploration missions (5)(6)(7)(8)(9)(10)(11).…”